Rock-drill.



c. A. BULTQUIST. nous DRILL. APPLICATION FILLYD vPEBJ), 1913.

1,077,911. I Patentedr Nov. 4, 1913.

, a sums-snm 1. 17

2 sums-slum 2.

Patented No8; 4, 1913.

c. A.' HULTQUIST.

ROCK DRILL. APPLICATION H LED FEB.5,1913. I

l I Zz?.7 Zo 78 `treme rig CHARLES A. HULTQUIST, DF LOS ANGELES, CALIFORNIA.

noon-nenn inv-aen Specification of Letters Patent.

Application filed February 5, 1913. Serial No. 746,662.

To all whom t may concern: Be it known that l, Crmenes A. Hnn'n QUisT, a citizen of the United States, residing at Los Angeles, in the count-y of Los Angeles and State of California, have invented new and useful Improvements in Rock-Drills, of which the following is a specification.

This invention relates to rock drills operl and improve the operation.

In carrying out my invention l employ separate plungers in the valve'for controL ling it and by the use oiI these separate plunger-s minimize the possibility of lealiage4 in addition to securing the foregoing advantages. i

Referring to'the drawings: 'Figure 1 is a longitudinal section through the drill,`sh`ow ing the piston. at a point s ightly beyond the center of its backward movement, with the Vvalve in corresponding position, the section being taken on line oel-m1, Fig. 2. Fig. 2 is aihorizontal section on line :v2-m2, Fig. 1 Fig. 8 is an end elevation. Fig. 4 is a plan view of the sleeve.- Fig. 5 is an enlarged section through the vallv'eyon the saine plane as Fig. 1.. Fig. 6 is a viewksimilar to Fig. 1, showing the piston at a further point in its rearward stroke and the valve having moved partially to the right. Fig. is a view similar to Fi 1, showing the piston at the eX- g ht 'and the valve at the extreme right in position to admit operating fluid at the back end of the piston to cause'the piston to move forwardly.` Fig, 8 is a section on line ml-w8, Fig. 5.

The drill comprises a cylinder 1 in whicl is a piston 2.A The cylinder has ports 3 and 4' which4 communicate with a valve chamber The valve chamber 5 has a steel lining sleeve 6 shown in detail in Fig. 4, and plugs 7 and 8 are screwed in opposite ends of the valve chamber 5. Motive iuid is introduced througha swivel 9 which has a shoulder 10 operating in a bearing formed in one end of the valve chamber 5 and being formed in one end of the valve chamber 5 and being formed with a recess 11 which has a bearing von a non-revoluble block 12, which is mounted in a lug 13 andretained by a bolt le which is screwed into the head of the plug 8 and has a tapered shank portion 15 fitting in the block 12. I have found. in practice that operators of the drill are apt to employ too much force in screwing up the bolt which controls the action of the swivel and with the present construction when the bolt 14 lis turned to tighten the swivel, the conical portion 15 will wedgeand bind in the block 12, thereby interposing a very considerable resistance to further turning of the bolt, thus obviating straining` of the bolt and result-ant breakage. lWhere. the bolt is screwed up too tightly, the constant vibration of the drill causes crystallization and breakage of the bolt which is avoided by this construction.

Thevsleeve has a central supply port a and on one side thereof, a cylinder port Z) and an exhaust port c, and on the other side thereotl a cylinder port b and an yexhaust port lo. These ports may be considered as extending circumferentially around the sleeve, although in fact they are segments on account of solid portions 16 which act as necessary bridges to retain thesleeve as one piece. ln each end of the sleeve are perforations 17 for allowing fluid to enter behind the valve from ports c, c. Valve chamber 5 is formed with annular grooves 18 registering with the respective ports .in the sleeve iny order to provide a circumferential communication of the air throughout each series of port segment-s in the sleeve.

Slidable within the sleeve 6 is a valve 19 which has a central' circumferential groove .d and end grooves e and e. The valve has recesses f, f" in each end `thereof and in the recesses f, f are plungers g and g. Leading from passage f to the surface of' the valve on the opposite side of groove d is a passage li and leading from recess f to the surface of the valve'on the opposite side of groove Z is a passage It. The outer portions of passages/lil and it" are bridged as shown in Fig. 8 in order to .insure an opening for the Patented Nov, e, 1913;..

loo

ports h or k. Thus if there were only one mei port 7L it might happen at some time to lic next to one of the bridging portions 1G ivhich would close communication through the port. In each end the valve is provided with a series of ports 2O for draining leakage as .vill be described. The valve also at each' end has a port 2l leading from passage e and e to the o uter end of the valve.

The cylinder 1 is provided with ports t, t" located at intermediate points and adapted to be covered and uncovered by the pistonin its movement., These ports are connected by passages y', y" with ports la, laf formed in the valve chamber at each end thereof and with which the ports 17 communicate.

Operation is as follows: Referring to Fig. l, the valve 19 is at its extreme throw to the left and lies against plug 7, While plunger g is at the extreme right against plug 8. Ini4 this position the plunger recess f is in com munication through passage 7L with cylinder port b, valve port e and exhaust port c so that t-here is no pressure tending to move the valve to the right, whilethe other plunger recess -f is in communication through port It with cylinder port vb and through valve port d with supply port a so that the air .pressure thus admitted to this lunger chamber holds the valve to the left until the proper time comes for it to move. Fluid is at this time Howing into the cylinder at port 3,v through valve port d and supply port a and causing the piston 2 to move to vthe right in the direction of the arrow. As

the piston continues moving in this direction, its front end uncovers port i', whereupon pressure from behind the piston Will flow through passage j to the space 7b at the -leftof the valve 19 and although there is pressure in plungenreccss f tending to hold the valve to the left, it will be noted that this pressure at j is only that amount which is exerted against the area of theinner Wall of the recess f, While the pressure in recess 7b is equal to the combined area of the valve 19 including the area of the end of the plunger g and therefore over-balances the pressure in recess f and commences to move the valve to the right, also-'moving plunger g. When the valve 19 has thus moved past the center of its travel at which time the piston 2 is near the end of its stroke, the parts being in theposition shown in Fig. 6, the exhaust of the cylinder at the port 4 is cut of by the valve which has moved its port e out of communication with passage 4 and at the same time partially opened-communication between the passage 4 and supply port a, and the supply of fluid to-the cylinder through the passage 3 is cut ofi" because valve port d which is in communication With the supply has moved out ofV communication Wit-h passage 3, and .passage 3 is just comin@ mtocomm'unication .B5 through'valve port e with exhaust lport c and also plunger recess f through passagc't is in communication Wlth cylinder port 7) and thence directly with valve port e and exhaust port c. At the point designated m the valve is admitting fluid to the cylinder through the passage 4 and through the medium of annula'i1 cylinder port 7) and passage 7L lto the plunger recess f and the pressure therein moves plunger g to the left, causing it to travel in the opposite direction to that in which the valve is now traveling, for at this time the valve hasnot yet entirely moved to the right. The valve will continue traveling to the right because at this time plunger recess f is open to exhaust and pressure in the plunger recess f is sulicient, the proportions being such thatthe valve will complete its movement tothe right at the same time the plunger g has been moved back against plug 7 to the left, this position of the parts being shown in Fig. 7, and the pressures in the respective chambers f and f hold the valve 19 alter nately against the plugs until the proper time comes forit to move and thus prevents all rebounding or fluttering of the valve. The parts having reached the position shown in Fig. 7, the space at the left of the piston is in communication with the cxhaust through passage 3, port e and cxhaust `port c', While fluid pressure is entering through passage 4 from valve port (Z and supply port a, whereupon the same operation takcs place in reverse order to that ,which has just been described.

The perforations Q0 are for draining out` any leakage that might occur from plunger recesses f or f along the plunger-s g and g should the latter become Worn, the leakage passing through perfor-ationsV 20 into exhaustsc, e. lf this leakage were not taken care of, pressure would pile up behind the valve in th'e recesses f and f which would interfere with the action of the valve. The perforations 21 which are of minute size are to take care of any leakage that might come from the cylinder. through the passages y or It will be seen that this construction prevents fluttering or rebound of the valve when it strikes the plugs 7 or 8 and that rockers, tappets' or auxiliary valves are eliminated, the valve being moved by Huid pressure. The fiuid which is utilized for moving the valve is first used in the cylinder for moving the piston. The valve and plunger are reversible and the Huid pressure n'ot operating on the valve, is effective over the full area of the valve which assures positive operation of the valve. -The plugs 7 and 8 are removable so that the valve can be removed from' either end ofthe lvalve chamber;

What I claim is:

1.- In a rock drill, a` cylinder, a piston cylinder, said ports beine;

invasi-i therein, a valve chamber, a valve in said chamber, said valve having plunger recesses in opposite ends, plungers in vsaid recesses andmovable with respect to the valve chamber .to allow air pressure to act on the combinefd` area of a plunger and the valve, ports between said Valve and cylinder for the admissionand exhaust of duid to and from the i controlled' by saidv valve; said valve having passages leading to the. respective plunger' recesses andv adapted to be moved into or out of communication with the cylinder ports, said cylinder having val've'ports with passages leading from the ports' to the valve' chamber for operating. said valve, and saidv valve ports being opened and closed by the movement of the piston.

'2'. In a rock drill', a cylinder, av piston therein, a valve chamber., a valve in said chamber, said valve having' av central circumferential groove and a circumferential groove on cach side thereof, thereby forining tivo end flanges and tWo center iianpges, the valve beingr formed with plunger recesses in opposite ends thereof, a plunger in each recess, the valve having` passages leading ,from the respective plunger recesses to points on the respective surfaces of the center flanges, the cylinder having' ports for the inlet and exhaust of fluid to operate the piston, said ports beine,` controlled by said valve, said cylinder also having` valve ports With passages leadingr from the respective ports to the opposite ends of the valve chamber, and said valve ports'being located at intermediatepoints of the cylinder and being' opened and closed by' the movement of the piston. v

3. In a rock drill, a cylinder, a piston therein, `a valve chamber, a valve therein, ports for the inlet and exhaust of fluid to and from the cylinder to operate the piston, said ports being4 controlled by said valve, said valve having' plunger recesses in opposite ends, pluncers in said recesses and movable with respect to the valve chamber to allow air pressure to act on the' combined area of a-plunfrer and the valve, and means controlled by the movement of the piston for ,admitting iiiiidrtofthe valve chamber at each end of the valve, and; for admitting uicl to the interior of said plunger recesses.

l. In a rock-drill, a cylinder, a piston therein, a valve chamber, ay valve therein', the cylinder havingports for the' inlet and exhaust of fluid to and from the cylinder to operate the piston, said valveV chamber having circumferential cylinder ports commumeeting with therespective latter. portsandi having a circumferential supply port be- -v tween said cylinder ports and having? circumferential exhaust ports on the outer side of the cylinder. ports, said valve" being formed with tvvo end flanges and tivo center flanges, thereby providing' a center circumferential groove and tivo end circumferential ,Qroovesg said valve being' formed with plunger recesses in opposite ends thereof and havin?,A passages leading from the respective plunger recesses to points on the outer surface of the center flanges of the valve, and plungers in said recesses, said cylinder' havingr valve ports at intermediate points With passages leading from said ports to the ends of the valve chamber.

5. In a rock drill, a cylinder, a piston therein, a valve chamber, a valve therein, thc cylinder having ports for the inlet and exhaust of iluid to and from the cylinder to operate the piston, said valve chamber having circumferential cylinder ports communicating' with the respective latter ports and having a circumferential supply port between said cylinder ports and having' circumfereiitial exhaust ports on the outer side of the cylinder ports, said 'alve being formed With two end flanges and tivo center flanges, thereby providing a center circumferential groove and two end circumferential grooves, said valve being` formed With plunger recesses in opposite ends thereof and having passages leading'` from the respective plunger recesses to points on the outer surface of the center flanges of the valve, pliing'ers in said recesses, said cylinder having valve ports at intermediate points with passages leading from said ports tothe ends of the valve chamber, and a sleeve lining in said valve chamber having segmental port openings vvliich register with the saidl circumferential ports in the valve chamber.

6. In a rock drill', av cylinder, a pistontherein, a valve chamber, a valve therein, the cylinder having ports for the inlet and exhaust of fluid to and from the cylinder to IOS' operate the piston, said valve chamber hav- I ing circumferential cylinder ports communicating .i'ith the respective latterports and having a circumferential supply port between said cylinder ports and having circumferential exhaust ports on the outer side of the cylinder ports, said valve being formed with two end lianges and two center flanges, thereby providing` a center circumferential groove and two` end circumferential grooves, said valv" being formedl With plunger recesses in opposite ends thereof. and having passages leading` from the ,i respcctive plunger recesses to points on the outer surface of 4the center flanges of the valve, plungers in said recesses, said cylinder having,` valve ports at intermediate points Withrpassagesleading from said-ports to. the ends of the' valve chamber, and a Sleeve lining in said valve 'chamber having vsegmental port openin which register with the .said circumferential ports in thevalve Chamlen'said passages in said valve being the cylinder having ports for the inlet and 'exhaust of fluid to and from the cylinder to operate the piston, said valve chamber l-aving circumferential cylinder ports communicating with the respective latter ports and having a eirclimferential supply port between said cylinder ports and having circunifercntial exhaust ports on the outer side of the cylinder ports, said valveI being formed with two endl flanges and two center flanges, thereby providing a center circumferential groove and two end circumfer ential grooves, said valve being formed with plunger recesses in opposite ends thereof and having passages leading from the respective plunger recesses to points on the outer surface of the center flanges of the valve, plungers in said recesses, said cylinder having valve ports at intermediate points with passages leading from said ports to the ends of the lvalve chamber, and a sleeve lining in said valve chamber having segmental port openings which register with the said ,circumferential ports in the valve chamber, the-valve Achamber having circumferential grooves near its ends for receiving air from the cylinder, said sleeve lining hav ing perforations near each end which commumcate With said latter grooves.

8. In a rock drill, a cylinder, a piston therein, a valve chamber, a valve therein, theI cylinder having ports for the inlet and exhaust of fluid to and from the cylinder to operate the piston, said valve chamber having circumferential cylinder ports communicating with the respective latter ports and having a circumferential supply port between said cylinder ports and having circumferential exhaust ports on the outer side of the cylinder ports, said valve being formed with two end flanges and two center flanges, thereby providing a center circumferential groove and two end circumferential grooves, said valve being formed with plunger recesses in opp'osite ends thereof and having passages leading from the respective plunger recesses to points on the outer surfaeeof thecenter flanges of the valve,

- plungers in said recesses, said cylinder hav- .ing valve ports'at intermediate points with passages leading from said ports to the ends ofthe valve chamber, and a sleeve lining in said valve chamber having segment-al port openings which register with the said circumferential 'ports 1nthe valve chamber,

said valve having radial perforations from valve chamber to allow air pressure to act on the combined area of a plunger and the valve, means controlled by the piston for regulating the admission of air to and from the ends of the valve, said plungers controlling the operation of the valve.

10. In a rock drill, a cylinder, a piston therein, the cylinder Ahavirg ports leading to the interior of the cylinder, a valve chainber, a valve therein controlling the passage of fluid through said ports, plugs screwed in opposite ends of the valve chamber, the drill having a lug, a bushing in said lug, forming a bearing, said bushing having a conical recess, the end of the valve chamber forming a bearing, a swivel journaled on said bearing, and a bolt extending through said bushing and screwed in the end of 'one of said plugs, said bolt having a tapered portion fitting the conical recess in the bushing.

11. In a rock drill, ay cylinder, a piston therein, the cylinder having ports leading to the interior of the cylinder, a valve cham- -'ber, a valve therein controlling the passage of fluid through said ports, the drill having a lug, a bushing in said lug forming a bearing, said bushing having a conical recess, the end of the valve chamber forming a bearing, a swivel journaled on said bearing and a bolt extending through said bushing and screwed in the head of said valve chamber, said bolt having a tapered portion fitting theconical recess in the bushing.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 30 day of January, 1913.

CHARLES .A. HU'LTQUIST.

In presence of- G. T. HACKLEY, F. A. CRANDALL. 

